Metal removing device



1950 A.H. ADANMS 2,526,624

METAL REMOVING DEVICE Filed Jan 51, 1949 4 IN V EN TOR.

Patented Oct. 24, 1950 METAL REMOVING DEVICE Albert H. Adams, Lima, Ohio, assignor, by direct and mesne assignments, to Kwik-Arc, Inc., Cleveland, Ohio, a corporation of Ohio Application January 31, 1949, Serial No. 73,735

2 Claims.

My invention relates to devices for, and methods of, removing a portion of a metallic body by electrically melting a portion of the metallic body, oxidizing the molten metal, and blowing away the oxidized metal.

One of the uses to which my device and method are particularly adapted is the removal of defects, such as the removal of sand particles, slag, or other foreign material from a ferrous casting, or the removal of other defective portions of a metallic body, such as an iron or steel casting.

Other uses and adaptations will be suggested by the disclosure of the herein described device and method. For the purpose of providing a concrete illustration and example of my device and method, the present description refers to the use of the device and method for the removal of defects in metallic bodies, such as the removal of sand and other foreign matter embedded in a ferrous casting.

An object of my invention is to provide an improved device and method for the rapid, efficient and safe removal of portions of a metal body.

Another object is the provision of a device and method for efficiently removing sand defects and other defects from a body such as a ferrous casting.

Another object is the provision of improved apparatus for melting a portion of a metallic body with an electric arc and the rapid oxidation of the melted metal.

Another object is the provision of apparatus adapted to electrically melt metal at a desired location, to quickly oxidize the metal at that location and to remove the molten metal without injury to the operator of the apparatus.

Another object is the provision of the apparatus, including an electrode for melting metal and oxygen-blast means arranged to extinguish the arc and simultaneously smother and oxidize the molten metal in a rapid and eflicient manner.

Another object is the provision of apparatus having the parts so arranged that metal can be removed as it is electrically melted by an arc, that oxygen is supplied at a point over the pool of melted metal to simultaneously smother the entire pool and at the same time to extinguish the are by the blast of oxygen.

Another object is the provision of an arrangement whereby the nozzle for ejecting an oxygen blast is so disposed and arranged as to produce the blast where desired and most efficient and yet without injury of the nozzle by the electrode or arc.

Another object is the provision of an electric arc-producing device and an oxygen-producing device provided with means for automatically moving the nozzle for the oxygen blast into the desired operating position When oxidation of the melted metal is to take place.

Another object is the provision of means for advancing an oxygen nozzle relative to an electrode by force of the oxygen blowing through a conduit to the oxygen-ejecting nozzle.

Another object is the provision of manual means for extending an oxygen nozzle to operating position adjacent an electrode when oxidation of the electrically melted metal is desired.

Another object is the provision of means for automatically retracting the oxygen-ejecting nozzle away from an electrode when the ejectment of oxygen is not required.

Another object is the provision of electrodeholding means and an oxygen-ejecting member so arranged as to angles and to spacing of the parts that a portion of the metal body may be quickly, efficiently and safely removed.

Another object is the provision of apparatus for removing metal by a combination of electrical heating and oxidation by an arrangement which is safe for the operator of the apparatus and easy and rapid in its manipulation.

Another object is the provision of an improved method for removing a portion of a metallic body, such as a ferrous casting.

Another object is the provision of an improved method for the removal of defects from a metal body.

Another object is the provision of an improved method for preparing a metal body for the efficient replacement of metal removed in the removal of a defect.

Another objectis the provision of a method which simultaneously removes a defect from a metal body and prepares the metal body for replacement of good metal, such as by the welding of additional metal thereto.

Other objects and a fuller understanding of the invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawing, in which:

Figure l is a side view of the preferred form of my device;

Figure 2 is a side view of a modified form of my device;

Figure 3 is a partial view of the device shown in Figure 2 and looking in the direction of the arrows 33 of Figure 2; and

Figure 4 is a view illustrating the forward end of my device in any of its forms in operating position in relationship to a ferrous casting having a portion removed.

In the form of my device illustrated in Figure 1, there is an elongated supporting frame denoted generally by the reference character H. This frame is comprised generally of an elongated electrode holder l in the form of a pipe or cylinder and a conduit member 23, which are linked or coupled together by a bracket or cou pling l2 and a bracket or coupling [3. The assembly of two parallel members, one the electrode holder and the other the conduit for oxygen, held firmly together by the brackets l2 and 13 provide the elongated frame member ll. Around the holder [5 and between the brackets l2 and i3 is an insulated covering M, which provides a handle or gripping member for the supporting frame.

Extending from the forward end of the holder I5 is a holder extension 13 secured thereto by the nut l7, so that members [5 and l3 in effect form a long holder extending through the frame II and forwardly from the forward end of the frame. A collar member 18 is secured to the forward end of the extension [6 by means of a turn screw shown in the drawing. There is a socket member l9 integral with the collar l8, which socket [9 has a cylindrical bore of inner wall adapted to receive and complementarily hold a cylindrical carbon electrode 29. The angularity of the bore in socket member if] is such that the upper included angle between electrode 2 5 and the holder I5 is on the order of '73 degrees, and the included angle between the lower end of the electrode 20 and the horizontally disposed holder is on the order of 107 degrees. In other words, a disposition of the socket is such that the carbon electrode 2D and its lower tip or operating end 2| is inclined away from the operator holding the handle i4 and looking forward toward the electrode.

It has been found that an inclination of the electrode actually as shown or within a range of a few degrees latitude is the preferable angle for the operators manipulation of the device and observation of the result. The lower end or operatillustration, is adapted to be connected to a source of suitable electrical energy, such as a generator.

A hollow conduit adapted to conduct a gas, such as oxygen, is also carried by the frame and extends through the brackets l2 and i3. This conduit, although made up of several parts, provides through communication for the oxygen or other gas. A pipe 23 of suitable length extends through an opening in the bracket 13 and to its outer or right-hand end there is attached a hose or other conduit 2 shown broken away at the right-hand end in Figure 1. The hose or conduit 24 is adapted to be connected to, and in communication with, a source of oxygen or other gas under pressure. At the forward end of pipe 23 there is a valve assembly 25 in communication with the pipe 23. An operators handle 26 operates the valve 25 so as to open and close the valve 25 upon manipulation of handle 26. Forwardly of the operating valve 25 there is an adjusting valve 21 in communication therewith. A handle 28 on the adjusting valve 21 provides for adjusting the orifice of the adjusting valve 2'! to predetermine the amount of oxygen blast which will be produced upon opening the operating valve 25. Forwardly of the adjusting valve 27 there is a union 35, which extends through an opening in bracket l2. Threadably secured to the forward end of the union 35 there is a sleeve or cylinder 32, also in communication with the opening through union 35, valve 21, valve 25, pipe 23, and hose 24.

A tube member 25, the embodiment shown in Figure 1, is adapted to move forwardly and rearwardly relative to the conduit formed by the valves and pipe 23, whereby the tube member 29 telescopically fits within the sleeve member 32. The rearward end of the tube member 29 is straight and is denoted by the reference character 33. Portion 33 has formed on its rearward end a piston portion 3!, which closely fits and slides along the inner walls of the sleeve member 32. The piston 3| has an opening therethrough communicating with the interior of portion 33 of the tube member 29, so that the hollow tube member 29 is in communication with the assembled conduit extending through the supporting frame. There is a forward nozzle tip 30 formed upon the most forwardly end of tube member 29. The forward axial end of tube member 29 and tip portion 30 is open to atmosphere so that a nozzle for the ejectment of oxygen or other gas is provided, the orifice of the nozzle being in alignment with the axis of tube member 29 at its forward end. Therefore, with valves 25 and 21 in an open position, oxygen under pressure entering pipe 23 from the hose 24 goes through the assembly and out through the open orifice of tube member 29 at the forward tip 30. The direction of the blast of oxygen is determined by the disposition of the forward end of the tube member.

The straight portion 33 of tube member 29 extends from the piston 3| to the angularly bent portion of the tube. This straight portion 33 provides a piston stem for the piston 31. There is a threaded plug 34, threadably secured to the forward end of the sleeve 32 and there is a hole in the plug 34 through which the straight portion 33 of tube member 29 slidably fits so that straight portion 33 may move forwardly and rearwardly through the plug 34. A spring 36 is mounted within the sleeve 32 around the straight portion 33 of the tube member 29. One end of the spring 36 abuts against the inner wall of plug 34 and the other end of spring 36 abuts against the end wall of piston 3|. The bias of spring 35 is such as to resiliently urge the piston 3! rearwardly, that is to the position illustrated in Figure l, and thus to retract the tube member 29 and tip portion 30 to the rearward position shown in full line in Figure 1. With the adjusting valve 2'! in an open position and upon the manipulation of handle 26 to open the valve 25, oxygen under pressure entering the sleeve 32 through the union 35 not only passes through the hollow interior of tube member 29, but also pneumatically forces the piston 3| forwardly, that is toward the left of Figure 1, and thus extends the tube 29 forwardly. The forward position of tube member 29 is shown in broken line in Figure l and the rearward or retracted position of tube member 29 is shown in full line in Figure 1. Therefore, when it is desired to supply a blast of oxygen to the v vicinity of the operating end 2] of the carbon electrode 20, the valves are so operated as to cause a flow of oxygen under pressure to flow through the assembled parts from hose 24. The oxygen under pressure will cause the forward end of the tube member 29 to immediately move forward to its extended position and oxygen will be ejected forwardly out of the open end of the tube member 29 and in the direction indicated by the disposition of the forward end of the tube member 29.

The angularity of the forward end of tube member 29, including the tip portion 30, that is, the angularity of the internal bore of the tube member, is such that the upper included angle between the axis of the tube or nozzle and the horizontal disposition of the frame member H is on the order of 53 degrees, and the larger included angle between the axis of the nozzle member and the elongated frame is on the order of 127 degrees. Therefore, the included angle between the axis of the electrode (which is the axis of the cylindrical socket l9) and the axis of the nozzle member at the forward end is on the order of 20 degrees. In practice it is found that an included angle on this order or within a range of a few degrees of this included angle of 20 degrees is preferable from an operating point of View.

The operation of my device and in the carrying out of my improved method the use of the same in removing the sand defects in a casting will be described. In the inspection of a ferrous casting, bits of sand or other foreign material are found embedded in the casting at or near th surface thereof. This is a defect and must be removed and good solid metal reinstated in its place. Preferably, a chalk mark is placed on the casting around the defective area to indicate the portion of the metal to be removed. This chalk mark is readily visible in the light of an electric are through the colored glasses worn by the operator. The operator holding the frame H in his hand and extending the forward end holding the "electrode 20 forwardly of him touches the casting at the defective area with the for- Ward tip 2f of the carbon electrode. By having the casting connected to a source of electric power as well as the cable 22, so that the casting forms one pole and the electrode 20 the other pole, a flow of current passes between the casting and electrode. The frame H and holder parts l5 and I6 are held substantially horizontal and parallel to the upper surface of the casting, so that the electrode is, inclined downwardly and forwardly. Upon slightly raising the frame to draw the electrode away from the casting while the current is flowing, an electric arc will be. set up between the casting and electrode at the defective area. This are melts the metal in the defective area and thereby forms a pool of molten metal in a crater in the casting.

Figure 4 represents the disposition of the parts with the electrode 20 held at operating position in relationship to the casting so that an arc is struck. In this view, the reference character 44 indicates a part of a metal body, such as an iron or steel casting. A crater or cavity 45 has been formed in the casting 44 by the heat of the arc melting the metaLin the defective area. The electric are from the electrode 20 is indicated by the reference character 48. It is to be noted that this are is vertical and extends in a direct line from the lowermost end of electrode 20" to the casting 44. The frame is substantially parallel with the upper surface 46 of the castin 6 I 44. At the time that the arc is on and the metal has been melted, the crater 45 is filled with molten metal, the upper surface of the pool of molten metal substantially coinciding with the upper surface of 46 of the casting 44. The stream of oxygen is illustrated by a series of arrows marked by the reference character 41. The greatest concentration of the stream of oxygen and the greatest force of the oxygen blast is in the middle of the stream and closest to the orifice of the nozzle. As the oxygen blast leaves the nozzle it spreads out to some extent as indicated by the arrows. In Figure 4 both the arc and oxygen blast are shown for purposes of illustration. In practice, both may be present for a short period but as herein described, the blast of oxygen soon extinguishes the arc.

In Figure 4, the broken lines between holder extension [6 and tube member 29, which lines are marked by reference character 49, indicate a. mechanical connection between the electrode holder and the oxygen conduit. This mechanical connection 49 may be the frame and assembly shown in Figure 1, may be the modified form of mechanical connection shown in Figure 2, or may be another mechanical connection within the spirit and intent of my invention, as covered by the appended claims.

After the arc has been struck and the electrode raised to substantially the position shown in Figure 4 so that the required amount of metal has been removed to free or obliterate the defect, no further melting is required. In practice, the distance between the electrode and casting will depend upon the power of the current being used and the force of the oxygen blast. The current and the supply of oxygen are correlated to the operation being undertaken. required amount of metal has been melted to loosen the defect, that is, to melt the metal around and in the defective area, then the further flow of an arc is no longer necessary. At this time the flow of oxygen is supplied to the nozzle member by manipulating the valve handle so that a blast of oxygen in suitably concentrated form and of sufficient quantity is ejected out through the orifice of the nozzle. This oxygen blast traverses the path of the arc and immediately extinguishes the arc. As seen from the illustration and as noted from the angularity of the several parts, there is a cross-fire between the arc and the stream of oxygen ejected from the nozzle. This cross-fire is such that the oxygen immediately and automatically extinguishes the arc and stops further melting operation. At the same time, the oxygen blast is directed downwardly over the entire pool of melted metal from a position and at an angle whereby the entire pool is instantaneously smothered or covered with oxygen. Substantially all parts of the pool of molten metal are contacted at the same time by the oxygen as the nozzle orifice is substantially over the crater 45 and the force of the oxygen blast and the spreading of the oxygen as it leaves the main stream of the oxygen blast is such that the oxygen reaches substantially all portions of the pool at once.

The angularity and disposition of the parts is also such that the force of the oxygen blast is at an acute angle to the surface of the pool and of the casting, which surface is also substantially parallel to the supporting frame of the device. Therefore, the direction of the force of the oxygen blast is to one side so that the force of the oxygen tends to blow the oxidized metal out of the crater As soon as the as in a direction that is forwardly and away from the frame. Thus the force of the oxygen is directed away from the operator holding the frame and operating the valve so that the danger of having hot molten metal or oxidized metal blown upon or toward the operator is obviated. The oxidized metal and any molten metal which may not have been completely oxidized is blown away from the operator for his safety and also for giving him a clear view of the crater.

After enough oxygen has been ejected, and usually only a short blast of oxygen is required, there remains a smooth clean crater of regular form and having a smooth polished wall. The condi tion of the crater after melting and oxidizing, as described, is such that new metal may be immediately welded into the crater to fill it up with new material welded to the casting. Thus not only is the operation simple, efficient and safe, but the device and method produce an excellent result in making the casting ready for immediately welding new metal to the casting to fill in the cavity left by the removed metal.

Inasmuch as the forward tip or operating end of the electrode becomes quite hot from the are and whereas it is desired to bring the forward end of the nozzle up quite close to this forward end, any danger of having the nozzle melted or otherwise injured by the electrode and the heat generated is obviated by the automatic retraction of the nozzle member when oxygen is not being ejected. In the form shown in Figure 1, the spring 35 automatically withdraws the tube 25 forming the nozzle rearwardly when the valve is closed to shut off the flow of oxy en. When it is desired to eject a blast of oxygen at the desired location immediately adjacent the tip of the electrode, then the valve 28 is operated to cause oxygen to flow. The force of the oxygen against the piston 3i causes the nozzle to immediately move to its extended position, shown in broken line Figure l, and the continued flow of oxygen through the orifice of the nozzle takes place, as 11- lustrated for example in Figure 4. Thus there is provided automatic means for extending and retracting the nozzle relative to its operating position.

In Figure 2 there is a modified form of my device in that manual means are provided for extending the nozzle to operating position when the ejectment of oxygen is to take place. In this modified form, the tube member 29 has a long straight portion 5?, which slidably engages in a suitable hole in bracket l2, whereby the tube member with its straight portion 3'! may move forwardly and rearwardly relative to the bracket I2. The rearward end of straight portion 3'! of tube member 29 telescopically fits within a sleeve or cylinder 39 in a close sliding fit, whereby the straight portion 8'! of the tube member 29 may move forwardly and rearwardly within the sleeve as, A flange or abutment Gil is welded or otherwise secured to the tube portion 3? so as to move forwardly and rearwardl therewith. A spring 4! around the tube portion 3? and interposed between the fiange 4t and the bracket l2 biases or urges the flange ill rearwardly to the position shown in Figure 2. Thus, the tube member 29 is biased to the rearward position shown in Figure 2 by the resilient action of the spring 41. The forward end of spring 4! abuts against abutting surface 38 of the bracket 12 and the rearward end of spring ll abuts against the flange 55 carried on the tube portion 5?, whereby the flange and tube secured thereto are resiliently g. urged rearwardly. The forward travel of the tube member 29 is limited by the spacing between bracket [2 and flange 40 and the thickness of the compressed spring therebetween.

A pivot support 50 integral with or carried by the sleeve 39 provides a pivot support for a manually operated lever 43. This lever 43 has a. handle portion readily manipulated by the operator and has a cam surface 42 which engages against the rearward surface of the flange 4B. The shape of the cam surface 42 is such that upon pressing the handle of lever 43 in a direction to oppose the spring 4|, the flange 40 is moved forwardly to extend the tube member 29. Upon release of the lever 43 by the operator, the action of the spring 4! moves the flange 40 rearwardly and thus retracts the forward end of the tube member 29 to its position shown in full line Figure 2. In the extended or advanced position of the nozzle at the end of the tube member 29, the nozzle is in the position shown in broken line in Figure 2. Thus in the form of invention illustrated in Figure 2, there is manual means provided for moving the nozzle member in one direction and automatic means moving it in another direction relative to the operating position of the nozzle. The adjusting valve 2! and the operating valve are similar to those shown in the form shown in Figure 1. By reason of the disposition of the parts in modified form, the pipe 23 in form shown in Figure 2 is somewhat shorter than that illustrated in the form for Figure 1. Similarly the straight portion 31 of tube member 23 in the form of Figure 2 is somewhat longer than the straight portion 33 of tube member 29 in the form shown in Figure 1.

My invention not only encompasses the automatic and manual means for moving the nozzle relative to the electrode, as illustrated by way of example in Figures 1 and 2, but also encompasses the spacing and angularity of the several parts, particularly at the forward end, as illustrated in Figure 4. Therefore, the mechanical connection indicated by the reference character 49 in Figure 4 not only includes the forms of supporting means illustrated in Figures 1 and 2, but also includes other mechanical arrangements whereby this desired spacing and angularity is obtained. Although in the preferred form of my invention as heretofore illustrated it is desired and a considerable advantage to have the nozzle member extendable and retractable, the arrangement that I have shown at the forward end of my device, and particularly the relationship between the socket l9 and nozzle formed by the forward end of the tube member 29 is such that new and surprisingly excellent results are obtainable.

My method of removing defects in large metal bodies, such as ferrous castings, has provided great economy in man hours in the removal of defects and in the replacing of metal removed. It was formerly the custom to use chipping hammers to manually chip out the metal around the defect so as to remove the defectiv area and to carefully form the wall of the cavity to prepare it for welding. By my method and with the use of my instrument the removal of defects is rapidly accomplished with a minimum of effort and with results which leave the casting or other metal body in a proper condition for instantaneous welding of new metal thereto. In actual comparison of the use of my device and th practice of my invention with the devices and methods heretofore used, there is such an astonishing difference in time, eifort and results obtained that the disclosure herein made is of great advantage to industry. The disclosure of my invention in improved apparatus and method is made so that knowledge thereof and protection thereto may be afforded under the provisions of the patent statutes. The present disclosure includes the foregoing description and the description of the device and method set forth in the appended claims which are incorporated herein by referenc as a part of this description.

Although the invention has been described in its preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and method, and the combination and arrangement of parts and steps may be resorted to without departing from the spirit and the scope of the invention as here inafter claimed.

I claim as my invention:

1. A device of the class described comprising in combination, an elongated frame, a handle carried by said frame, an electrode support carried by and extending forwardly from said frame, said support having an electrode-receiving socket, the axis of said socket being disposed at an angle to said frame to direct an electrode received therein forwardly of said frame at a first angle to the frame, electrical connecting means car ried by said frame and adapted to be connected to a source of electrical energy and to conduct electrical energy to said electrode, a conduit carried by said frame and adapted to be connected with a source of oxygen under pressure, a movable tube in communication with said conduit, connecting means telescopically interconnecting said tube and conduit to permit forward extension and rearward retraction of said tube relative to said conduit and toward and away from the axis of said socket, said tub terminating in a nozzle portion, the axis of said nozzle portion being disposed at a second angle to said frame and at an acute angle to the axis of said socket, the axis of said nozzle portion being disposed intermediate said handle and the axis of said socket, piston means carried by said connecting means and adapted to be actuated by said oxygen under pressure for moving said nozzle portion in one direction, biasing means for urging said nozzle portion in an opposite direction, said nozzle portion being extendable in one of said directions toward the axis of said socket to an operating position, the location of said operating position being such that the forward end of said nozzle portion is adjacent, and at a distance less than the diameter of, but outwardly of, an extended cylindrical outline of said socket, said nozzle portion being retractable in the other said directions to a retracted position, the location of said retracted position being such that the forward end of said nozzle portion is spaced from said cylindrical outline a distance greater than the diameter of said cylindrical outline to avoid heat generated by an electrode held by said socket, and Valve means carried by said frame for controlling the flow of oxygen through said conduit to said nozzle portion.

2. A device of the class described comprising in combination, an elongated frame, a handle carried by said frame, an electrode support carried by and extending forwardly from said frame, said support having a, cylindrical-electrode receiving socket, said socket having a cylindrical bore complementary to said electrode, the axis of said socket being disposed at an angle to said frame to direct an electrode received therein at an angle to said frame, electrical connecting means carried by said frame and adapted to be connected to a source of electrical energy and to conduct electrical energy to said electrode, a conduit carried by said frame and adapted to be connected with a source of oxygen under pressure, a movable tube in communication with said eonduitjconnecting means telescopically intercom necting said tube and conduit to permit forward extension and rearward retraction relative to said conduit and toward and away from the axis of said socket, said tube terminating at its forward end in a nozzle, the axis of said nozzle being disposed at an angle to said frame and at an angle of less than 45 degrees to the axis of said socket, the axis of said nozzle being disposed rearwardly of the axis of said socket, piston means carried by said connecting means and adapted to be actuated by said oxygen under pressure for moving said nozzle in one direction longitudinally of said frame, biasing means for urging said nozzle in an opposite direction, said nozzle being extendable in one of saiddirections toward the axis of said socket to an operating position, the location of said operating position being such that said nozzle is spaced from an extended cylindrical outline of said socket a distance less than the diameter of said cylindrical outline, said nozzle being retractable in the other of said directions a distance greater than the diameter of said cylindrical outline to avoid heat generated in an electrode held by said socket, a valve means carried by said frame for controlling the flow of oxygen through said conduit to said nozzle.

ALBERT H. ADAMS.

REFERENCES UliTED The following references are of record in the.

file of this patent:

UNITED STATES PATENTS Number Name Date 857,247 Menne June 18, 1907' 866,498 Menne Sept. 17, 1907 1,137,834 Bowers May 4, 1915 1,436,557 Wysong Nov. 21, 1922: 1,910,668 Benard May 23, 1933'. 2.427.588 Burnett Sept. 16, 1947, 

